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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939059a30ade4a9698b34b5c379900581672c8335923c039bbce088640fb64fe' 
  AND token = 'I4/NxCIvUDy2KfOQ2biexptbSLpe2+6CP2QLrd4Hkwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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