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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a16246f8f5b33d3e7fcb9b2fdc10f12cbefaf0d1ee09cbb40e87cb3d18f0681' 
  AND token = 'OspnLb4SBv2x7rlnq2hGNMPguyL95dRd6Q3R1UJoI+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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