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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e01ed889b14ad132126e6a1835c34a3915742d14197096a1df6520e4dadf12' 
  AND token = 'BTfoDFjdSzUkpiw2sZ2aIUUUKIWR3GEneNZiF29GRHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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