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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3184cfb0395a0f5a72cb6b0d3718cecbc0ef3a0cc891109f370014e8dab2f3' 
  AND token = 'VzMNi4KmIPLabD64319c4rpXTwNsgRd74IZ5ze4HV6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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