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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62dc9381ac597e1a61628ee144da78d1874344f8fad4d7673a10d37e956585f' 
  AND token = 'JC0AeLR80zW/lRqQA/qWZ1DM+uqtN1gjMZrlog+y+yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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