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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02e4793b51df2930b6913e2a65c571800503b051416b9ebd0aa30798646acac' 
  AND token = 'Ct7gPDJ4LArp6uW/pC8YuNPlvlXj0yXix1WH77Om94o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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