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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cada863c05f0c3c51a5deb543d906e062533d4f1b8d002103b01714eb72dfe69' 
  AND token = 'YF6hh5iWiG8KLkN1SBasrV1vAxBl05rcFva2LZEdY5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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