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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ece32b0325bb305d4e6651ffb824ca7b3f95940272fc61c48ec16557aa905e' 
  AND token = 'JjY8stHHXl0i1duh1kI51Xlgd66y4wZwrs+RsS9UdHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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