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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98747cd642a6ed64095528e26e823c9760a0e2cb7d6265ed0d37a63ae416901' 
  AND token = 'yEFxaWsqx+dc6+zkwsz1l7PUYS7Fda8zU/MUahVzMFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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