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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc2924976a6e2a7d01c7ab3d7b6be6a3b44628b3159c46fdfb6e979a808d55e' 
  AND token = 'nk1c3i+TswcaNzH7SjanK4cOquQ+hNYaYKpNvb7U9Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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