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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b95846496040a7a7505d0f4755b9993dc761490aa611a3e2faa3dd56de44950' 
  AND token = '3bXmXm1+RcX4IE+9T0Q439at6VpkBRGwNJljntLUgc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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