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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2aa64d9b99d3fc84d2b04d564ce373071acb35665e392cf7ef6b3b7072bb1c' 
  AND token = 'WtGXBfSgrggIBcyVLL9CY4u+YTDAATHLEdT4WFD0mjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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