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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bb3e0759a82e62771b7ac593f99afa975b5b25770827e16a4c1a30b7e8b0da' 
  AND token = 'I1wz2WIQeeW61DBQpIlqK3I5yZBylfd+L7i2j8WclLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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