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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56097989702a6feaebdb490b0b9141ddb74f37e44a3019f855c04df48890e3b' 
  AND token = 'MOBi/qA8ZzEyoUEA9/seWhoaGc6bHUFfitftt3FK8Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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