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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e062b7d22f7dd351d5e8221df3025429c700530117af42b604817963a55dca' 
  AND token = 'BNxvVl1f2ps94kO+A+pvHtzL7Ad+ReU25EQhQN93ghg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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