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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af77bc8c4a26da50a07493657c29aca58ed073cff591f7ede4fdbf1948b2d757' 
  AND token = '2ni27wa42RPP1gnzvsFQ6CN0FgGdNCKUjKcuc7/IRjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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