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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4c544afd00f3a3a5b9549de0fb0c61c0a16475a719e261d614fab9485fe324' 
  AND token = 'nSKYPZXdLuI89k1G1k5wu5EqsJlxa8HOCb4Mvy7Q1gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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