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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa56a250baca70ed9e17e3712fd6f49bbb2db962c06bc96ee0f2e9bf345def66' 
  AND token = '7LLmWsDux9Ik36O5lg3NYfUheYN9Ld8qtKF47SEV7Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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