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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51847f971e0d4a7edc639498758d183b42dfb7f142c3441a93bfc56a677ff2b8' 
  AND token = '7jgYH/30DeNiDPna1oH4NiPB8vod3cpMuzzPGa+d2ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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