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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc48c3e6e118843bbc0161beab9108bf983daaf64aa0176403e119cd1fed0c6' 
  AND token = 'x9LDxLZrX80cuP6sgxASl/UMemfOLy/Mz7/QKO2B7K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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