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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47eb7495e043cd12913a380203d2ed5ad9bf54445139081eead20f039d3957d9' 
  AND token = 'K6EkLcoOmSQDS+LrXRI3+rD12A6tDFAhx3+1z7Q/N24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}