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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb25bbd9391e55fca4c9c21842484215f46f2db9f85a2324cd64f841f0bbc90d' 
  AND token = 'zKv0q/HhXuayMIz5yp5cvAiJg9fiRrGiBWHm3j/TeN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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