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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bb339c68e995406c736f17c300d940b83de79168d5cd28b901d4dfb2ddc91c' 
  AND token = 'oh/Qp79bl2N6hoxAmcqSw1l0dNtoDBWGjrs7Gu7wqyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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