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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61ed3199842a6713e8d333336e6009eff21f620e075ce61601bce162f9d2d34' 
  AND token = 'rwDIcICkMho1m+P6yQ5+8cDz9ANnZUBm4kvyeO9965Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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