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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8467108db5848854b9f7b0b43c669e58e155f8af506c92c05fcd4d3f165339' 
  AND token = 'LwKSsZkuSuSlRbDDxih/U1pH54qxpL19+5/1wwI+bcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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