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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d00a1f3f2e687843b3a0918fd5028375ebbdfb1794f47f52e38de99127db4d' 
  AND token = 'T1wCtBq2p5HXO52PhCKktLvf4hHfRW77tBsptpVyo9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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