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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bce261f14a4441bdf5f3a42783619ed6acd5722253e8c6b38515e426e7854a7' 
  AND token = 'Om+QqBE3kRc4K4Fyqh2clCITdeqbO5dWocoNrVQhafg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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