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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42907a00e614c5e790f76e78ff8a97c82c103b11fa8032765fc52b5e03bdd0fa' 
  AND token = 'EXuqVe1baMT1SRIivz5Fq0+CWT4zklNnxzLNhfN0FwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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