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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12074c8ed7a5d477616ef2a40b43897742469ff9850af2f825643c7c667026ee' 
  AND token = 'kvx6ttlBNUEeSg5DuWDyaW5Nhdy9KRm2vm/rC5aG3Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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