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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5894fcb6bf0163cffbbb47f0ff38d3d8f6f20b4b32ba8b9cc5d9933c0083c9' 
  AND token = 'kS/dQJjjUMp0ViZFBGDi1pgGHftHAY6GTdJYVBfdmkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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