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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897cc3b1c0810fc2e6e5c927866ccc7c52caedd84493d147d1eff4995140f8a3' 
  AND token = 'OB4l5cnhrhdPZ3SOAZEcnxPBggd7jq01Cg6ah+MIzJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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