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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2f905882fea086659e3c9732bcf3aee733b3a342d0bb25b05c60c07b671940' 
  AND token = 'HEfCeKObO+wHJV73VrIasmYxY/0ESG2aPY9i8bwijgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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