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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9002e6883230b9d0d8dcae952f4e83d7065b6fae4798238af0e3681b9b807c8c' 
  AND token = 'I4XVK+FiZDuTYWLe8mkUjEO6HqvbSduckXscLdALW5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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