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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e45793a471e057b726469af5303ebb69d5dcd9a8526a4d392833f1c475f22ec' 
  AND token = '7CXzNkBWdBZIpkHe2sl/vNkLQLjEosFnoTjUN7bJZ04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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