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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda10fa06b9d7ca785fb32c3a161c0e3d19717a2d3fec78c4c5e63f8d5e1f32b' 
  AND token = 'UH4h03jZT9YyOTD3cT4uW99DAHAJwBwh8La+oAYYi5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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