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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd502eabb000b83501f9da99c0d847cdccc7acf828657cf15f0ec7616b47dc47d' 
  AND token = 'S/x5eo7TrBFp5ld1zCqj+/e+mef9sw7g2Cd7WYatoIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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