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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274a005224f29ee0417ab497f3856d07fe8db6455bb8bfbf33ea113498b63d7a' 
  AND token = 'CYO5dl57gH6zyA23M7JkVmPIRf7s6x6Y15q1Q8e2lVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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