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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9bf2ef4c34d19e07ad2af3ac775fd0ce4a73c782576016a844cd632e1830469' 
  AND token = 'lbLMjWYQgJYRZSibifsV99JzyeS3EHUjKfqHvWI88Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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