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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f071fc4698cced33b4738eadff8eef78f16438953f8598fcbf441faf55049fb4' 
  AND token = '/awvZmpEzv0ySRNiBiok4s9o4jMH7Ec+dLYWHE36ldo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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