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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4364b7fd4f23f549e969eae4351b141f72bef653b64829de799fb7ae288020c' 
  AND token = 'i37M1m7J4+KgsqHs8yg27OX3/fo1bOonCxCjSbbsqhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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