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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64913a88d4588c007b57fda453e20f55d15212d815ab7cd566e2510d39d83825' 
  AND token = 'CNhbSlJ20ELO56uyJvvuH9wzlv4rnX9NJSd0w+1DkC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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