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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e392372a9306c94e23c115eb8d0c5e4f13973e24b82288184f62ba2209787a' 
  AND token = 'V+ciCvunxjZW9azavguK0tNgk2W5M3IRRF6drYeYUUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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