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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10703995cdb1e9634b09d2c6c1c75bd9825aca4437e6cda8cd13ed89ac95446a' 
  AND token = 'IRKyOhZ4o5qDLhwVsQJEQlCmJqxI01TS/RET8AU4zfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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