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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c47d12dc668d1a2f82b42cb9f2cb3713d554c3246bdce05bbce0449cf56feef' 
  AND token = '1SpgpSVpIz2QrBWESy7wUHfGytJWi8D4s+WCCD/TYfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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