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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5fec7c7c9558c6b597117e2bbdc4013aece523840889fe8d74166e0567ef78e' 
  AND token = '0+5M07T7/jZxZ0dfMxfso9rIXUeLrRbfJmFiNQ9WNBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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