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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1476760a1d0366a966cb5f705cde9fe42003e7774505ec81d0435fcd3e3d5b2a' 
  AND token = 'WF+SY7SRPWl8u4YAOFsZfI0Q3lc5yUdo6mCSS0ZJhXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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