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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6e817bd3f9e181da2d91943b5f9bc4918cf7872b06ba94cef6817514264d16' 
  AND token = '3lCBHZbl9KtMPbex3XcRKWWQ11bu5blNrSRdUn1zvkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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