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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc128e01a94b4c82f69c9b44cea5c99f86f2ad54c4238a61fd3cc4f6c6926f93' 
  AND token = '3ze5yKBTWc9O2UstnA02yMeIF/B1IOE1R+HmBijS2Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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