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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cee67ad92131cb101d9495276903e9074f19456306d8ebf99a39a8e7c1f8d69' 
  AND token = 'aW5wKHaERpNz0KoKe5F/iFew3AVqWyE9+dD6H3xNoOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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