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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4e6ce878cf80a2b83322cb74ac5b8ca7625552b73084af02f2b9a7949cfd26' 
  AND token = '83nALqnd6CJkd+pJT+RJJWvr4d3oHrEsBZCXzbOKH/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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