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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630d085011cd19c043af8ca2db5a9557f9df5b47a9f272d4a2ce8e3584faf298' 
  AND token = '7/4LE2Vv+mEwC2d6FEUQ3b2QigP2IAFZZl2YvU/MP0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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