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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a3614f60844e347ba53f975a2d4cff93f985fe14842f16f4600a048b5f4d5e' 
  AND token = '06PqKxXxS/uceLfxxXw2jS4/qUk4Q+UkIW99AB2IjQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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