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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0600e327b6eac07712c4e334bb174d0aedcdae152fa125e632886a37c517870f' 
  AND token = 'CTL+8GHnNdkIze39jWybIQ9vrNludMkwdi243Y6Ah0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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