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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660211a95ce6efe3379cd7fe237529560df6e3df8f1c70d02e10cdc1aac3f4e8' 
  AND token = '8iHRNEXYGOPmm2pSjL2ETit76O6HGy2bM/93GJ7UUmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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