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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06ae22ff6306af27dab987d8098d1a53df7004c5addfd2319ab67323ed8c1f5' 
  AND token = 'iA+epI43NqSgeNe00Ma5FHxh1DOyo/soE1+Q5TOgwn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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