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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed020ed070272762129f0f644e24bcee6abf2f1b7ca639b5cb5be9b33c3c131a' 
  AND token = '5PurqBTSIcOQgdhHHqP9Oylg9KeoNvJadXmYm+2VkU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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