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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7526343ffe62e7547ecb5bf93cdea2cc0d183eeb03bd8f7d86d9a0d5233adce3' 
  AND token = 'Blk2Nl/zlWSvty4QXo/coR2jmRr0MOuNrxSfTo1jwmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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