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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b130a5a79c11b25b61c6cf89ec7cbfb44ede37a7b5e44dba29677449361951f' 
  AND token = 'ba9HP+2JqqSqJFLcpyQ4peYDMObkfYl3dPZ3Ti7sc9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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