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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35fb2d3dff147625280f9725d5a767a2ac629d86038f02e87aaf8d0fa07aed8' 
  AND token = '9JAZ55LaSnvnBt1jv87WN2QOJdEn93EBkWR2V11oi/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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